Arhitektura i realizacija univerzalnog web senzora - Telfor 2007
Arhitektura i realizacija univerzalnog web senzora - Telfor 2007
Arhitektura i realizacija univerzalnog web senzora - Telfor 2007
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[4] Institute of Electrical and Electronics Engineers, IEEE<br />
standard for a smart transducer interface for sensors and<br />
actuators—transducer to microprocessor communication<br />
protocols and Transducer Electronic Data Sheet (TEDS)<br />
formats, IEEE Std. 1451.2—1997, 1997.<br />
[5] S. Vitturi, On the use of Ethernet at low level of<br />
factory communication systems, Comput. Stand.<br />
Interfaces 23 (2001) 267– 277.<br />
Sl. 6. Pregled zauzee memorije mikorkontrolera.<br />
Web senzor je testiran na dvije vrednosti taktne<br />
uestanosti: 20 MHz i 8MHz. Testiranje je izvršeno u<br />
kontinualnom vremenskom intervalu od 24h. U tom<br />
periodu nije primjeena nikakva nepravilnost u njegovom<br />
radu. Rad na nižim taktnim uestanostima potencijalno<br />
može voditi do gubitka pristiglih paketa, o emu treba<br />
voditi rauna pri izboru taktne uestanosti<br />
mikrokontrolera.<br />
Pored oiglednih prednosti, embedded <strong>web</strong> serveri<br />
imaju i odreene nedostatke koji se odnose prvenstveno na<br />
ograniene resurse upotrebljenih mikrokontrolera. Samim<br />
tim i funkcije <strong>web</strong> servera kao i nivo interakcije sa<br />
korisnikom je ogranien.<br />
Da bi se omoguilo dalje unapreenje funkcija <strong>web</strong><br />
servera potrebno bi bilo izabrati mikrokontroler koji<br />
posjeduje više programske memorije od korištenog<br />
mikrokontrolera. U sluaju da se implementiraju zahtjevne<br />
funkcije, onda je potrebno obratiti pažnju i na procesorsku<br />
mo mikrokontrolera.<br />
Potrebno je naglasiti da se na strani klijenta, koji koristi<br />
standardni <strong>web</strong> pretraživa mogu prikazati podaci dobijeni<br />
samo iz jednog <strong>web</strong> <strong>senzora</strong>. Meutim, ako se zahteva<br />
prikaz rezultata mjerenja iz veeg broja prostorno<br />
distribuiranih <strong>web</strong> <strong>senzora</strong>, onda je primjena standardnog<br />
<strong>web</strong> predraživaa neprikladana. U tom sluaju potrebno je<br />
razviti posebnu klijent aplikaciju koja ima mogunost da<br />
komunicira sa veim brojem <strong>web</strong> <strong>senzora</strong>, prikuplja od<br />
njih podatke, obrauje ih i prikazuje.<br />
LITERATURA<br />
[1] International Standard Organization, Road Vehicles—<br />
Interchange of Digital Information –Controller Area<br />
Network for High Speed Communication Draft<br />
Amendment, ISO 11898: 1993/DAM 1, 1994.<br />
[2] European Committee for Electrotechnical<br />
Standardization, General Purpose Field Communication<br />
System: Vol. 2. Profibus, EN50170 r 2, Dec. 1996.<br />
[3] Institute of Electrical and Electronics Engineers, IEEE<br />
standard for a smart transducer interface for sensors and<br />
actuators—Network Capable Application Processor<br />
(NCAP) information model, IEEE Std. 1451.1—1999,<br />
1999.<br />
[6] C. Szabo, An Ethernet compatible protocol to support<br />
real time traffic and multimedia applications, Comput.<br />
Netw. ISDN Syst. 29 (1997) 335– 342.<br />
[7] A. Popovi, V. Drndarevi, P. Lazarevi, N. Jefti,<br />
“Primjena specijalizovanih mikrokontrolera u realizaciji<br />
<strong>web</strong> servera internet baziranih merno-upravljakih<br />
sistema”, ETRAN, Herceg Novi, 8-13 juna, 2003, Tom 1,<br />
str. 60- 63.<br />
[8] V. Drndarevi, M. Boli, A. Popovi, Radiation<br />
Monitoring System Based on Internet, Proceeding of 3 rd<br />
International Yugoslav Nuclear Society Conference,<br />
Belgrade, Yugoslavia, October 2-5, 2000.<br />
[9] Institute of Electrical and Electronics Engineers, IEEE<br />
802– 3: Part 3. 2000 standard, Carrier Sense Multiple<br />
Access with Collision Detection (CSMA/CD) and<br />
Physical Layer Specifications, 2000.<br />
[10] National Instruments, Austin, TX, www.ni.com<br />
[11] Microchip Tech. Inc., Arizona,, www.microchip.com<br />
[12] MikroElektronika, Beograd,<br />
www.mikroelektronika.co.yu.<br />
[13] Atmel Corp., S. Jose, CA, Application Note,<br />
AVR460: Embedded Web Server, www.atmel.com.<br />
[14] Robert G. Fuller and Laurie Ann Ulrich, “HTML in<br />
10 Simple steps or Less ”, Wiley Publishing, Inc., 2004.<br />
ABSTRACT<br />
This paper presents architecture and design of universal<br />
<strong>web</strong> enabled sensor. Sensor can be used for monitoring of<br />
different environmental parameters via the Internet. Client<br />
can access universal <strong>web</strong> sensor by standard <strong>web</strong> browser.<br />
Web sensor is realised by means of commercial<br />
inexpensive electronic components: standard 8-bit<br />
microcontroller and Ethernet controller. Web sensor<br />
prototype is build for the performance test. At this stage,<br />
the input signals are simulated with signal generator.<br />
ARCHITECTURE AND IMPLEMENTATION OF<br />
UNIVERSAL WEB SENSOR<br />
Željko Ivanovi, Vujo Drndarevi, Mladen Kneži<br />
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